How can I find the extension of the common boundary between i and j patches in matlab???

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Mona
Mona 2013-2-10
i and j are the two connected regions , In which I want to find the extension of the common boundary between them.....

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Image Analyst
Image Analyst 2013-2-10
Where did you upload your image that illustrates this problem? You forgot to tell us the URL so we can see it. So, lacking that the only thing I might suggest is either the convhull() function or the watershed() function http://blogs.mathworks.com/steve/2006/06/02/cell-segmentation/.
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Mona
Mona 2013-4-6
编辑：Mona 2013-4-6
Sir, can you please help me to implement this code as i am new to Matlab and also cant understand the above method which you have described above.Thank you in advance.
Image Analyst
Image Analyst 2013-4-7
编辑：Image Analyst 2013-4-7
Not even any code at all? Here then, try this:
% Demo to find the two blobs and AND them
% together to find the common boundary..
clc; % Clear the command window.
clearvars;
workspace; % Make sure the workspace panel is showing.
format longg;
format compact;
fontSize = 20;
% Read in a standard MATLAB gray scale demo image.
folder = 'C:\Users\Mona\Documents\Temporary';
baseFileName = 'Ko0PgU.bmp';
% Get the full filename, with path prepended.
fullFileName = fullfile(folder, baseFileName);
% Check if file exists.
if ~exist(fullFileName, 'file')
% File doesn't exist -- didn't find it there. Check the search path for it.
fullFileName = baseFileName; % No path this time.
if ~exist(fullFileName, 'file')
% Still didn't find it. Alert user.
errorMessage = sprintf('Error: %s does not exist in the search path folders.', fullFileName);
uiwait(warndlg(errorMessage));
return;
end
end
grayImage = imread(fullFileName);
% Get the dimensions of the image.
% numberOfColorBands should be = 1.
[rows, columns, numberOfColorBands] = size(grayImage);
if numberOfColorBands > 1
grayImage = rgb2gray(grayImage);
end
% Display the original gray scale image.
subplot(2, 3, 1);
imshow(grayImage, []);
title('Original Grayscale Image', 'FontSize', fontSize);
% Enlarge figure to full screen.
set(gcf, 'units','normalized','outerposition',[0 0 1 1]);
% Give a name to the title bar.
set(gcf,'name','Demo by ImageAnalyst','numbertitle','off')
% Threshold
binaryImage = grayImage == 255;
% Thicken black lines to close it up
binaryImage = imerode(binaryImage, true(5));
% Get rid of border
binaryImage = imclearborder(binaryImage);
subplot(2, 3, 2);
imshow(binaryImage, []);
title('Binary Image', 'FontSize', fontSize);
% Label the image so we can extract each blob.
[labeledImage numberOfBlobs] = bwlabel(binaryImage);
blob1 = labeledImage == 1;
blob2 = labeledImage == 2;
subplot(2, 3, 3);
imshow(blob1, []);
title('Blob 1', 'FontSize', fontSize);
subplot(2, 3, 4);
imshow(blob2, []);
title('Blob 2', 'FontSize', fontSize);
blob1Dilated = imdilate(blob1, true(7));
blob2Dilated = imdilate(blob2, true(7));
% And these two together to find overlap region
overlap = blob1Dilated & blob2Dilated;
subplot(2, 3, 5);
imshow(overlap, []);
title('Blob 1 & Blob 2', 'FontSize', fontSize);

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Mona
Mona 2013-4-7
I have referred above code but in that when we apply thresholding on any image and then imerode and imclearborder then it gives the whole black image i mean all pixel values have value '1' , so how to get the number of objects from that image??????
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Image Analyst
Image Analyst 2013-4-8
I can't help you debug it unless I have the exact image you have, because it worked fine for the image you uploaded.
Mona
Mona 2013-4-8
Yes sir I have downloaded image and then applied the above code it works well but in final section I want to find the extended length of the common boundary. means red line in the image .So can You help me to find out that ?????? I will grateful to you in advance and thanks for help and support.

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